title: The secret behind the mask.
authors.forename: Yuguo
authors.initials: Y
authors.lastname: Li
mesh_terms: D016902:Air Pollution, Indoor / Q000032:analysis / Q000517:prevention & control*; D003140:Communicable Disease Control / Q000379:methods*; D018562:Disease Transmission, Infectious / Q000517:prevention & control*; D006801:Humans; D008397:Masks; D012141:Respiratory Tract Infections / Q000175:diagnosis / Q000209:etiology / Q000517:prevention & control